/**
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {ok} from 'assert';

export function assert<T>(
  item: T | null | undefined,
  message?: string | Error,
): asserts item is T {
  ok(item, message);
}

export function assertIs<T, U extends T>(
  item: T,
  assertion: (i: T) => i is U,
  message?: string,
): asserts item is U {
  ok(assertion(item), message);
}
